Form not sending email and test email show error

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Hello, I've this error when I try ton send a email test (see capture). I discover the bug because no email are sending from the forms on the website. Where Can I change something to delete or modify this html <br /> balise who is probably the problem. I use the Default PHP Mail Function. Thx for helping me

Error text -> The following error was found while trying to send the test email:<br />Unable to send mail: Unknown error

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concrete5 Environment Information

Concrete 8.4.2

Browser User-Agent String

Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:61.0) Gecko/20100101 Firefox/61.0